Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"Total Electron Content"”.
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Total Electron Content During Auroral Conditions
Coordinated spectrophotometric and ionospheric electron content measurements were conducted during a variety of auroral conditions at Churchill, Manitoba for a total of 14 clear nights in November and December, 1984. Ground based narrow angle filter photometers measured the temporal history of 4278 …
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Total Electron Content reconstruction using triple frequency GNSS signals
… frequency, and directly proportional to the Total Electron Content (TEC) of the ionosphere. In the last 20 years, several techniques using dual frequency GNSS measurements have been developed to estimate the TEC. With these techniques, systematic errors are confined to at least - 2.5 and 2.5 …
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Plane wave parameter estimation using gps estimates of total electron content in a neural network
… opportunity to continually monitor the free electron density in the ionosphere. Physical phenomena, such as tsunamis, have been shown to create wave features in the free electron density. The parameterization of these waves is of interest to the scientific community. Here, we investigate the …
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An Investigation of magnetic storm effects on total electron content over South Africa for selected periods in solar cycles 23 and 24
The development of regional ionospheric Total Electron Content (TEC) models has contributed to understanding the behavior of ionospheric parameters and the coupling of the ionosphere to space weather activities on both local and global scales. In the past several decades, the International Global …
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Variations Of E-Region Total Electron Content And Electron Density Profiles Over High Latitudes During Winter Solstice 2007 Using Radio Occultation Measurements
… This research focuses on the variation of total electron content (TEC) and the electron density within the E-region of the ionosphere, which extends from 80-150 km above the surface of the Earth, using radio occultation measurements obtained by COSMIC satellites and using Ionospheric Data …
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Development and applications of ionospheric tomography
… several tomographic techniques for ionospheric electron density imaging have been proposed. These techniques reconstruct a vertical slice image of electron density using total electron content data. The data are measured between a low orbit beacon satellite and fixed receivers located along the …
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Design of a satellite beacon receiver for ionospheric remote sensing
… making the link more robust. In particular, the total electron content is an important characteristic to model for the possible distortions of this signal. Expensive receivers have been designed and deployed to receive satellite signals and provide such needed information, but we will make use of …
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Ionospheric imaging using computerized tomography
… used to produce a two-dimensional image of the electron density in the ionosphere. The necessary data are transionospheric satellite beacon total electron content (TEC) data recorded simultaneously at multiple ground stations.
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Influence of lightning on electron density variation in the ionosphere using WWLLN lightning data and GPS data
… over South Africa. Lightning induced changes in total electron content (TEC) are strongest between September and March, with the more-pronounced effects occurring 12:00 - 22:00 UT, but from April through August there is a low probability of having significant lightning-induced TID occurrence. The …
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Low-Cost Real-Time Precise Point Positioning (PPP) Correction Service with High Availability and Accuracy
… is used to represent global ionospheric Vertical Total Electron Content (VTEC) corrections, while the Slant Total Electron Content (STEC) map and polynomial model are developed for representing regional slant ionospheric and zenith wet tropospheric corrections, respectively. The low-cost real-time …
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Tsunami monitoring using airglow imaging systems
… presence of a tsunami for over a decade in the total electron content and for over 5 years in the 630.0 nm airglow. Here, we provide a comprehensive overview on the utilization of airglow imaging systems for monitoring tsunamis. We develop the basic theory behind tsunami-ionospheric coupling …
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Analysis of Ionospheric Data Sets to Identify Periodic Signatures Matching Atmospheric Planetary Waves
… lower thermosphere. The ionospheric data-set is Total Electron Content (TEC), which is used to identify periods during which the ionosphere appears to respond to the planetary waves. Data from KP and F10.7 indices are used to determine events that may be of external origin. A 17-year time-span …
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Quantification of Effect of Solar Storms on TEC over U.S. sector Using Machine Learning
… 24 is presented to quantify their effects on the total electron content (TEC) in the ionosphere. We study the dependence of TEC over the contiguous US on various storm parameters, including the onset time of the storm, the duration of the storm, its intensity, and the rate of change of the ring …
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Dynamics of the geomagnetically disturbed ionosphere as measured by GPS receivers and SuperDARN HF radars
Total electron content (TEC) data measured from ground-based GPS receivers is compared to HF backscatter from ionospheric irregularities obtained by Super Dual Auroral Radar Network (SuperDARN) radars. We present the first observations of a recurrent region of anomalous enhanced TEC at …
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Medium Scale Travelling Ionospheric Disturbances sensed with GNSS TEC and SuperDARN
… Global Navigational Satellite Service (GNSS) Total Electron Content (TEC) techniques and coherent scatter radars such as the Super Dual Auroral Radar Network (SuperDARN). MSTIDs, especially those observed during quiet times and on the night side, have been known to be driven by electrodynamic …
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GNSS-based Spacecraft Formation Flying Simulation and Ionospheric Remote Sensing Applications
… flying. Ionospheric remote sensing, such as Total Electron Content (TEC) measurements or ionospheric irregularity studies are important potential Low Earth Orbit (LEO) applications. A GNSS-based Hardware-in-the-loop (HIL) simulation testbed for LEO spacecraft formation flying has been …
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2-D radio imaging of equatorial ionospheric plasma depletions with the C/NOFS satellite: algorithms and results
Local depletions in the equatorial ionospheric electron density, known as spread-F events, have been an active area of scientific research in the last decades. These are of special interest to the research community because of their potentially deleterious impact on trans-ionospheric communication …
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Nonlinear State Estimation of the Ionosphere as Perturbed by the 2017 Great American Eclipse
… the amount of solar radiation it receives and a total solar eclipse produces a short perturbation to the incoming solar radiation. Analyzing how the ionosphere reacts to this type perturbation could lead to new levels of understanding of it. This study develops a nonlinear filter that estimates …
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Calibration of a SuperDARN Radar Antenna by means of a Satellite Beacon
… on the satellite is to measure the ionospheric total electron content (TEC) by using either measurements of the carrier phase delays or of the Faraday rotation of the signal. An orbit analysis was done for the CubeSat using parameters for an orbit at an altitude of 600 km and inclination angles …
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